Ubuntu18.04使用f3probe检测U盘实际容量

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使用f3probe 能快速检测出被测U盘的实际容量, 命令

$ sudo f3probe --destructive --time-ops /dev/sdc
F3 probe 7.0
Copyright (C) 2010 Digirati Internet LTDA.
This is free software; see the source for copying conditions.

WARNING: Probing normally takes from a few seconds to 15 minutes, but
         it can take longer. Please be patient.

Bad news: The device `/dev/sdc' is a counterfeit of type limbo

You can "fix" this device using the following command:
f3fix --last-sec=15840992 /dev/sdc

Device geometry:
	         *Usable* size: 7.55 GB (15840993 blocks)
	        Announced size: 1.82 TB (3907028992 blocks)
	                Module: 2.00 TB (2^41 Bytes)
	Approximate cache size: 0.00 Byte (0 blocks), need-reset=yes
	   Physical block size: 512.00 Byte (2^9 Bytes)

Probe time: 7'
 Operation: total time / count = avg time
      Read: 3.61s / 4479 = 806us
     Write: 6'23" / 2483 = 154.4ms
     Reset: 33.87s / 57 = 594.2ms

Ubuntu18.04下可以直接安装

$ sudo apt install f3

.